Natural talent is to blaze up, we hear (5)
I believe the answer is:
flair
'natural talent' is the definition.
(I've seen this before)
'blaze up we hear' is the wordplay.
'blaze up' becomes 'flare' ('flare' can be a synonym of 'blaze up').
'we hear' shows a homophone (sound like).
'flare' sounds like 'FLAIR'.
'is to' acts as a link.
(Other definitions for flair that I've seen before include "Bent" , "Talent; elegance" , "Stylishness; talent" , "Natural talent or panache" , "Taste" .)